Chair back adjusting means



April 1957 s. R. v. GEBELIUS 2,790,487

CHAIR BACK ADJUSTING MEANS Filed Aug. v3, 1954 23 INVENTOR.

Maxwell E.Spcrrow.

ATTORNEY.

-. ven Runo Vilhelm Gebelius.

United States Patent CHAIR BACK ADJUSTING MEANS Sven R. V. Gebelius, Stockholm, Sweden Application August 3, 1954, Serial No. 447,591

Claims priority, application Sweden December 9, 1953 2 Claims. (Cl. 155-161) This invention relates to improvements in chair devices, particularly arm-chairs, and it is one of the objects to provide an arm-chair by means of which it is made possible easily and quickly to adjust the chair-back in diiferent angular positions in respect to the vertical plane, in order that the user may occupy the most comfortable and restful position.

The invention will be understood from the following description taken in connection with the accompanying drawings, which schematically and by way of example show an embodiment of the device according to the invention.

In the drawings:

Fig. 1 shows a chair-frame in a perspective view equipped with the device according to the invention;

Fig. 2 shows a vertical section of the chair-frame;

Fig. 3 shows a detail in section taken on line AA in Fig. 4;

Fig. 4 shows a detail in section taken on line B-B in Fig. 3.

Referring now in more detail to the drawings, the numeral 1 denotes the chair-legs and 2 the seat-frame. The side-pieces of the chair-back are denoted by the numeral 3. Between these side-pieces a cross piece 4 is provided, and in parallel relation to the said crosspiece there is between the side-pieces of the seat frame 2 provided a cross-piece 5.

The end portions of the side-pieces 3 of the backframe are bevelled at 6, and the longitudinal side-pieces of the seat-frame 2 are correspondingly bevelled at 7 so that a V-shaped opening is formed between the said ends. When inclining the chair-back in another position than that shown in the drawing, the swinging axis will be as indicated at 8.

The desired resiliency is obtained by means of a number of leaf springs 9, the drawing indicating two such springs, which are arranged in longitudinal direction of the chair and fixed to the cross-pieces 4 and by means of bolts or the like, the said springs being adapted to hold the chair-back in a position shown in Fig. 1.

In order to prevent that after the chair-back having been inclined to the desired position returns to its initial position, a locking device is provided which according to the embodiment shown in the drawings consists of a tubular member 13. Tubular member 13 is maintained at its one end by means of a mounting 14 articulatingly fixed to the front cross-piece of the seat-frame. In the other end of the tubular member 13 a bar 15 is telescopically slidable. The free end of the said bar 15 is by means of a thin leaf spring 16 fixed to the underside of the cross-piece 4 of the back-frame. means the tubular member 13 may together with the bar 15 perform angular movements when the chair-back is inclined.

By means of a locking device the bar 15 may be locked in different positions within the tubular member 13. As shown by Figs. 3 and 4, this locking device consists By these' of a bar 17 disposed perpendicularly to the longitudinally disposed axis of the tubular member 13 and the bar 15 The bar 17 passes through a bore in the chair-leg 1 and the seat-frame 2, and is on its outer end provided with a handle. On its inner end the bar 17 is longitudinally slidable within a casing 18 which is provided above a:

recess in the tubular member 13. A spring 19 forces the bar 17 to an initial position. A stop-screw 20 will limit the longitudinal movement of the bar 17.

The bar 15 which is longitudinally slidable within the tubular member 13, is on the upper side provided with a number of transverse slots 21, which a protruding portion 22 of the bar 17 may arbitrarily engage, thereby locking the bar 15 and consequently the chair-back in the desired position. The tubular member is provided with a longitudinal slot 23, in which a stop-screw 24 is slidably disposed on the bar 15 and which stop-screw will limit the longitudinal movement of the bar 15.

When pushing the handle in the direction of the arrow, against the force of the spring 19, Fig. 3, in which the bar 17 is shown in locking position, the protruding portion 22 will disengage the slot 21, and the bar 15 may be moved longitudinally within the tubular member 13, until another slot comes into locking position, whereupon the handle 25 is relinquished, and the portion 22 engages the other slot 21. According to another embodiment, not shown in the drawings, the bar 17 is on its inner end provided with teeth and adapted to engage, through a transverse bore on the tubular member 13, grooves on the bar 15 which grooves correspond to the slots 21.

In order to make it possible to slide the bar 15 to its initial position, after the locking device 17 having been released, a pressure spring 31 is provided with a certain initial pressure within the tubular member 13, which spring will press upon the end of the bar 15, as soon as the bar 17 disengages any of the slots 21. Thus, the chair-back will return to its initial position.

In Figs. 1 to 4 there is described a device for chairs, particularly armchairs, by means of which it is possible easily and quickly to adjust the chair-back in different angular positions relative to the vertical plane, the said chair-back being pivotable by means of a spring device and adjustable in different angular positions by certain members which are adapted to lock or release the chairback respectively.

The invention is not to be limited to the embodiments described in the specification and shown in the drawings, it being understood that the same may be varied and combined in many ways without departing from the spirit of the invention or limiting the scope of the invention.

It is evident that the embodiments herein described and visualized in the drawings may be used in all kinds of chairs, the chair-backs each of which is adjustable in different angular positions and lockable by means of a member equivalent to the bar 15a.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. In a chair construction, a generally horizontal seat frame, generally horizontal leaf springs having their forward ends fixed to said seat frame and extending rearwards therefrom, an upstanding chair back having its lower end fixed to the rearward ends of said leaf springs and resiliently supported by the latter for swinging movement between upstanding and inclined positions, adjustable means for resiliently locking said chair back in any selected position of its swinging movement, said locking means comprising a tubular member articulatingly affixed to the front of said seat frame and a bar slidable in said member, one end of said bar being flexibly affixed to said chair back, the other end of said bar Patented Apr. .30, 1957,

being provided with a plurality of slots located within References Cited in the file of this patent saidfixinber, and 'a'transverse bar springily disposed on said member and engageable with said slots, the free end UNITED STAIES PATENTS lig tgqqswgse hapbgin l sl dalzly-mqup q in asi e 700,06 M r May 13, 1902 of. ea t f r ar ne, 5 1,773,597 Myerson Aug. 19, 1930 V aml ehair ccording 19 claim 1, wh rein ai 2,595,240 Glick May 6, 1952 trg yez seb ag is lpngj tugljnallysliglalgle,in ahogglng prp; 2,642,120 Cochran June 16, 1953 l d 1 iii/said cm fk d p Y i e l Q 1 th'im r "en wl ip q wdie p fisari lfi h i a t to' eng ge EQREIGN PATENIS sgg 10 193,49} greet Bp ilaj n Fel 2 -,6, 1923 

